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   1  <?php
   2  
   3  /**
   4   * ASN1 Signature Handler
   5   *
   6   * PHP version 5
   7   *
   8   * Handles signatures in the format described in
   9   * https://tools.ietf.org/html/rfc3279#section-2.2.3
  10   *
  11   * @author    Jim Wigginton <terrafrost@php.net>
  12   * @copyright 2016 Jim Wigginton
  13   * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
  14   * @link      http://phpseclib.sourceforge.net
  15   */
  16  
  17  namespace phpseclib3\Crypt\EC\Formats\Signature;
  18  
  19  use phpseclib3\File\ASN1 as Encoder;
  20  use phpseclib3\File\ASN1\Maps\EcdsaSigValue;
  21  use phpseclib3\Math\BigInteger;
  22  
  23  /**
  24   * ASN1 Signature Handler
  25   *
  26   * @author  Jim Wigginton <terrafrost@php.net>
  27   */
  28  abstract class ASN1
  29  {
  30      /**
  31       * Loads a signature
  32       *
  33       * @param string $sig
  34       * @return array
  35       */
  36      public static function load($sig)
  37      {
  38          if (!is_string($sig)) {
  39              return false;
  40          }
  41  
  42          $decoded = Encoder::decodeBER($sig);
  43          if (empty($decoded)) {
  44              return false;
  45          }
  46          $components = Encoder::asn1map($decoded[0], EcdsaSigValue::MAP);
  47  
  48          return $components;
  49      }
  50  
  51      /**
  52       * Returns a signature in the appropriate format
  53       *
  54       * @param \phpseclib3\Math\BigInteger $r
  55       * @param \phpseclib3\Math\BigInteger $s
  56       * @return string
  57       */
  58      public static function save(BigInteger $r, BigInteger $s)
  59      {
  60          return Encoder::encodeDER(compact('r', 's'), EcdsaSigValue::MAP);
  61      }
  62  }